Which of these lines from walt whitman's “i hear america singing” describes a unified america?
(i hear america singing, the varied carols i hear,)
those of mechanics, each one singing his as it should be blithe and strong,
(the carpenter singing his as he measures his plank or beam,)
(the mason singing his as he makes ready for work, or leaves off work,)
(the boatman singing what belongs to him in his boat,) the deckhand singing on the steamboat deck, . .

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?